Achieving the knowledge it takes to become a Renaissance man or woman is difficult these days, as people change jobs frequently. In fact, workers switch firms roughly every five years, the Bureau of Labor Statistics reports. Read about what it takes to juggle multiple jobs, in today’s Personal Finance pages.

Plus, see why investors continue to brave the crowds in Omaha for the annual Berkshire Hathaway shareholders’ meeting, read about why more people are buying luxury building plans online, and submit your photos of what tax-refund money is best spent on.

Why Jay-Z has 5 careers, and you don’t

Given the still-shaky job market, many Americans would like to dabble in a variety of fields. But career experts say that unlike Jay-Z, most people aren’t well enough established in one vocation to simultaneously venture into another. Why Jay-Z has 5 careers, and you don’t.

Went to Omaha, all I got was a Buffett bobblehead

As attendance at the annual Berkshire Hathaway Inc. shareholders’ meeting has ballooned over the years, mutual-fund managers say it’s become trickier to land some personal time with Warren Buffett—but easier to take a piece of him home. Went to Omaha, all I got was a Buffett bobblehead.

Can an app replace your architect?

Does that mansion look familiar? More people are buying luxury building plans online, then customizing them to add individual touches; paying extra for a soaking tub and wine-tasting room Can an app replace your architect?

Staying Zen at 30,000 feet

The $175,000 mattress

Can a quality mattress be a work of art? London-based Savoir Beds, which bills itself as a “world-renowned manufacturer of bespoke luxury mattresses,” says it’s offering just that with its new Royal Bed. The $175,000 mattress.

People haulers, supercars at the NY auto show

Take a look at the latest in tech, safety and innovation from the New York International Auto Show, featuring luxury and performance vehicles as well as family-friendly people haulers. People haulers, supercars at the NY auto show.

How to invest in North Korea

North Korea is believed to possess a wealth of natural resources like gold and iron ore. While it’s not easy to invest in the country, and may not be smart, it can be done. How to invest in North Korea.

Why SEC Twitter rules won’t work

To see why the Securities and Exchange Commission had no choice but to allow companies to release news via social media, one need only look at what happened when the agency itself announced what it was doing. Why SEC Twitter rules won’t work.

Why the new iPhone can’t lose

Apple fans have high hopes that the next iPhone will introduce some long-awaited improvements, but even if it turns out to be just an incremental improvement over its predecessors, experts say it’s likely to be the best-selling smartphone of all time. Why the new iPhone can’t lose

Mom and pop: The world’s worst investors

How will you spend your tax refund?

Send us photos of what you bought (or plan to buy) with your refund. MarketWatch will spotlight the best reader-submitted photos from Twitter and Instagram published with the hashtag #myrefund. How will you spend your tax refund?

RETIREMENT

How to defend against health-care fraud

Health-care fraud, especially insurance scams, costs Americans an estimated $80 billion each year, according to the FBI. And boomers in particular get hit hard: having to pay the price of scams. How to defend against health-care fraud.

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